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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 31 |
| 2 | 619 |
| 3 | 10171 |
| 4 | 150115 |
| 5 | 2075227 |
| 6 | 27499123 |
| 7 | 354164107 |
| 8 | 4472448739 |
| 9 | 55701408763 |
| 10 | 686884421587 |
| 11 | 8409900709483 |
| 12 | 102430894160323 |
| 13 | 1242818548606939 |
| 14 | 15036887507052211 |
| 15 | 181551642806017099 |
[1,31,619,10171,150115,2075227,27499123,354164107, 4472448739,55701408763,686884421587,8409900709483, 102430894160323,1242818548606939, 15036887507052211,181551642806017099] |